Constant deprecation warning when using StatsPlots in Pluto notebook

[mkschleg]

Details

Whenever I'm using StatsPlots in a pluto notebook I get the following warning.

┌ Warning: seriestype violin has been moved to StatsPlots.  To use: `Pkg.add("StatsPlots"); using StatsPlots`
└ @ Plots ~/.julia/packages/Plots/Awg62/src/args.jl:1206

To reproduce, in a pluto notebook just do:

using StatsPlots
violin(rand(20))

This floods the standard output on the terminal running the pluto notebook server.

Plots.jl version: 1.20.0
Backend version (]st -m <backend(s)>):
Output of versioninfo():

Julia Version 1.6.0
Commit f9720dc2eb (2021-03-24 12:55 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin19.6.0)
  CPU: Intel(R) Core(TM) i5-1038NG7 CPU @ 2.00GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-11.0.1 (ORCJIT, icelake-client)

[sethaxen]

This issue came up again in fonsp/Pluto.jl#1870. There, I said:

The warning about violin moving to StatsPlots is being trigged here because this condition evaluates to false:

Plots.jl/src/args.jl

Line 1578 in 2896c5a

if st in (:boxplot, :violin, :density) && !isdefined(Main, :StatsPlots)

@fonsp explained that Pluto doesn't evaluate user code in Main and suggested replacing !isdefined(Main, :StatsPlots) with fonsp/Pluto.jl#1870 (comment):

!haskey(
	Base.loaded_modules, 
	Base.PkgId(
		Base.UUID("3fa0cd96-eef1-5676-8a61-b3b8758bbffb"), 
		"REPL"
	)
)

This would be an alternative (and perhaps simpler?) fix to #3357, which it seems has stalled.